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Phenomenology of the minimal B ? L extension of the Standard Model at the LHC

Phenomenology of the minimal B ? L extension of the Standard Model at the LHC
Phenomenology of the minimal B ? L extension of the Standard Model at the LHC
A well-motivated framework to naturally introduce neutrino masses is the B ? L model, a U(1) extension of the standard odel related to the baryon minus lepton gauged number. Besides three right-handed neutrinos, that are included to cancel the anomalies (thereby naturally providing neutrino masses), this model also encompasses a complex scalar for the spontaneous symmetry breaking of the extended gauge sector and to give mass to the Z? boson. We present the phenomenology, the discovery potential at the LHC, and the most up-to-date experimental and theoretical limits of the new particles in this model. In the gauge sector, a Z? boson is present. We study its properties (i.e., production cross sections, branching ratios, total width), showing that it is dominantly coupled to leptons. We also present a detailed discovery power study at the LHC and at Tevatron for the Z? boson. In the fermion sector, after implementing the see-saw mechanism, we end up with three heavy neutrinos. We show that they can be long-lived particles (therefore providing displaced vertices in the detector), and that they can induce spectacular multi-lepton decays of the Z? boson. We also study the full signature pp ? Z? ? ?h?h, and present a parton level and a detector level analysis for the tri-lepton decay mode of the Z? boson via heavy neutrinos. In the gauge sector, the two Higgs fields mix. We derive the unitarity bound and the constraints from the renormalisation group equations study. In the allowed region of the parameter space, we delineate the phenomenology of the Higgs bosons and we show characteristic signatures of the latter, at the LHC, involving the Z? boson and the heavy neutrinos
Basso, Lorenzo
c9d03f26-0be7-487c-8810-ae3b9ffa924c
Basso, Lorenzo
c9d03f26-0be7-487c-8810-ae3b9ffa924c
Moretti, Stefano
b57cf0f0-4bc3-4e02-96e3-071255366614

Basso, Lorenzo (2011) Phenomenology of the minimal B ? L extension of the Standard Model at the LHC. University of Southampton, Faculty of Physical and Applied Sciences, Doctoral Thesis, 131pp.

Record type: Thesis (Doctoral)

Abstract

A well-motivated framework to naturally introduce neutrino masses is the B ? L model, a U(1) extension of the standard odel related to the baryon minus lepton gauged number. Besides three right-handed neutrinos, that are included to cancel the anomalies (thereby naturally providing neutrino masses), this model also encompasses a complex scalar for the spontaneous symmetry breaking of the extended gauge sector and to give mass to the Z? boson. We present the phenomenology, the discovery potential at the LHC, and the most up-to-date experimental and theoretical limits of the new particles in this model. In the gauge sector, a Z? boson is present. We study its properties (i.e., production cross sections, branching ratios, total width), showing that it is dominantly coupled to leptons. We also present a detailed discovery power study at the LHC and at Tevatron for the Z? boson. In the fermion sector, after implementing the see-saw mechanism, we end up with three heavy neutrinos. We show that they can be long-lived particles (therefore providing displaced vertices in the detector), and that they can induce spectacular multi-lepton decays of the Z? boson. We also study the full signature pp ? Z? ? ?h?h, and present a parton level and a detector level analysis for the tri-lepton decay mode of the Z? boson via heavy neutrinos. In the gauge sector, the two Higgs fields mix. We derive the unitarity bound and the constraints from the renormalisation group equations study. In the allowed region of the parameter space, we delineate the phenomenology of the Higgs bosons and we show characteristic signatures of the latter, at the LHC, involving the Z? boson and the heavy neutrinos

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Published date: June 2011
Organisations: University of Southampton, Physics & Astronomy

Identifiers

Local EPrints ID: 200123
URI: https://eprints.soton.ac.uk/id/eprint/200123
PURE UUID: 0f87aa6f-6216-4349-ae63-b977dc3541a2

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Date deposited: 02 Nov 2011 11:48
Last modified: 18 Jul 2017 11:15

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